The first attempt to send a commercial spacecraft to the International Space Station was aborted…
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Saturday's launch was scrubbed when an onboard computer detected what SpaceX CEO Elon Musk described as "slightly high combustion chamber pressure" in one of the Falcon 9 rocket's nine engines, all of which are needed to lift the unmanned Dragon capsule into orbit. The problem was later traced to a valve in engine five, which has since been replaced.